| 摘要 |
A deep bed filter (10)principally used for filtration of contaminated aqueous fluid comprises a layer of polymeric cylindrical particles (70) in combination with a layer of anthracite particles (60) and a layer of sand (50). The polymeric cylindrical particles are approximately 1.5 millimeters in diameter and in the range of 6-12 millimeters high, with a specific gravity of approximately 1.15. When the filter is backwashed particles of anthracite mix with a portion of the polymeric particle layer, thereby creating larger surface voids for penetration of larger contaminant particles into the filter.
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